A common problem when simulating the steady-state operation of a complex energy system is that the many working-fluid cycles cause convergence problems in the simulation. A tedious and lengthy trial and error procedure is then necessary. Even worse, manual solution strategies are often part of the oral tradition within companies. Cycle-Tempo avoids this hassle by offering a very robust and fast algorithm tailored to the specific problem of energy systems. It can handle very demanding situations like the simulation of a complete IGCC power plant with CO2 capture.